I hope someday Sherlock and Mycroft can be better friends. ( It's the only thing I dislike in the show, they changed their relationship from the books. They were at least civil and perhaps pretended to be friendly with one another...

I love you. I was going to write this idea myself. Why does Sherlock know nursery rhymes better than the solar system? But mine was going to be more along the lines of Mother used to sing them all the time.

Or I was thinking about a case fic where the killer used nursery rhymes. Anyway. Sorry.

This was really cute, a nice interpretation that explains a lot of unanswered questions. I liked it. Good job.